How much is too much light durring dark in flower?

Ive got 2 girls going in the attic and I exhaust through a vent in the ceiling. I basically just mounted a fan to the vent. The vent is covered on the outside almost entirely by an aluminum fixture but a little light creeps through. Then the fan blocks even more. Its just a faint blue-ish glow in a small part of the vent that I would say is less than moonlight. Will this be a big problem for their dark cycle? Also, every now and then I have no choice to go in during dark to water but I use a flashlight. Bad?

I've heard time & time again that green light can not be used by the plants. So invest in a green light. & I go by the rule of hand in m face. During the dark hours if you can see your hand a foot in front of your face then it is not dark enough.

If you think about it, the moon is pretty bright half the month. especially when its full. if that doesnt bother the plants, i dont think you have a problem. about the flashlight though... use a green light like 1lastgodsend said. good luck!

great question!!
ive always wondered how plants growing outdoors would be affected by a full moon during there dark cycle. i thought moonlight was reflected sunlight but im also no einstien on the subject of astronomy or what not....
any knowledge on this would be awsome!!!

I think it depends on what they are used to dealing with. If you grow outdoors, your plants have no choice but to deal with moonlight/reflections during their dark cycle. But I've heard once you go indoors, you need it to be pitch black. Any pinhole light leaks can cause stress leading to hermies. Then again back to dealing with it, if the light leak has always been there, then maybe they could deal with it better. The main thing is you don't want the leaks to be random light leaks. And as for going in to water during lights off...don't do it. Change your light schedule if you can't get in there during the right hours.

I read that even a 1% light leak on an indoor grow can cause up to a 10% decrease in bud production. I think a small slip for a few minutes here and there wouldn't have such a negative effect but if you have that much leaking in every night, I think your buds will suffer. Try duct tape where you can. Could you add a little bit of ducting with an elbow in it to prevent the light leak from your fan?

And, yes, I JUST read in Jorge Cervantes book that a green light bulb is fine and will not interrupt the night light cycle.

There you go man. Green light is a genius move. Avoid any light leaks because your buds will start to grow seeds & that's not good. Change your watering schedule too. Or maybe consider watering less often. Once a week is fine. Or just stick your finger in your dirt if it feels too dry then give it some water.

1lastGodsend said:

There you go man. Green light is a genius move. Avoid any light leaks because your buds will start to grow seeds & that's not good. Change your watering schedule too. Or maybe consider watering less often. Once a week is fine. Or just stick your finger in your dirt if it feels too dry then give it some water.

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I grow in a room adition at my house. There is a little bit of light thru the cracks in the T and G and I have no problems with buding. If you can see your plants in the darkness, you have a problem.

Keep in mind complete darkness is the best for large quantities of resin production. & we all know resin is heaven to us. But if your plant does manage to bud even with a slight leak then I guess your fine. As long as it's not a heavy leak. Hermies are weird & seeds in your final product is whack. (I'd still smoke the fruit though) but if you notice that it's been 2weeks or more in the 12/12 cycle & still no sign of the flowering stage being induced then your light leak will be the problem.

tdiddy said:

Ive got 2 girls going in the attic and I exhaust through a vent in the ceiling. I basically just mounted a fan to the vent. The vent is covered on the outside almost entirely by an aluminum fixture but a little light creeps through. Then the fan blocks even more. Its just a faint blue-ish glow in a small part of the vent that I would say is less than moonlight. Will this be a big problem for their dark cycle? Also, every now and then I have no choice to go in during dark to water but I use a flashlight. Bad?

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noooooooooooooooooooo never show them light wen they are in dark cycle it will slow them from growing if u must use a green lens light as long as the colour of the light is green its ok but u should water wen light 1st comes on really and then may b a top up 6hours latey but not in the dark cuz its not warm u can get root roat and funguy wat u dont want cuz that will jus fuck them up i got few pics on my profile have a look

So these are slightly mixed answers. I know light is bad but it would have to be enough to start some process in the plant, right? You couldn't grow a plant with constant distant light from a small flashlight, let alone a brief glance-over, so can it really be that bad? Has anyone had an experience that can actually say this made a difference?

Plant use light to start their photosynthesis process. So if a plant is in their dark hours trying to rest from being in the photosynthesis process all day. Any light can cause it to go back to it's sugar making process & disturb it's sleep. Better? Anything else to help?

Even a flash of light or flipping a light switch on then off can mess up their flowering.

The difference between indoors and outdoors is the intensity of the light. Direct sunlight is 32,000-130,000 lux while a full moon is 1 lux at tropical latitudes. One lux is equal to 1 lumen per square meter.